diff --git a/packages/mdc-select/_mixins.scss b/packages/mdc-select/_mixins.scss
index 3a8e855051e..a8484bb267e 100644
--- a/packages/mdc-select/_mixins.scss
+++ b/packages/mdc-select/_mixins.scss
@@ -109,7 +109,7 @@
     @include mdc-theme-prop(background-color, $color);
   }
 
-  .mdc-select__bottom-line:after {
+  .mdc-select__bottom-line::after {
     @include mdc-theme-prop(background-color, $color);
   }
 }
diff --git a/packages/mdc-select/mdc-select.scss b/packages/mdc-select/mdc-select.scss
index 59c52015504..99e626a820d 100644
--- a/packages/mdc-select/mdc-select.scss
+++ b/packages/mdc-select/mdc-select.scss
@@ -157,7 +157,7 @@ $mdc-select-menu-transition: transform 180ms $mdc-animation-standard-curve-timin
 
   @include mdc-select-focused-bottom-line_ {
     &::after {
-      transform: scale(1,2);
+      transform: scale(1, 2);
       opacity: 1;
     }
   }